| on an equal footing with | on an equality | on an equality with | on an errand | on an even keel |
| on an impulse | on an individual basis | on and off | on and on | on another level |
| on any account | on application | on application to | on approval | on arrival |
| on attachment | on automatic pilot | on average | on bad terms | on bail |
| on balance | on base | on beat | on behalf of | on bended knee |
| on bended knees | on board | on board a ship | on borrowed time | on both sides |
| on break | on business | on call | on camera | on campaign |
| on campus | on canvas | on cash | on cloud nine | on commission |
| on condition | on condition that | on consignment | on cost | on course |
| on credit | on cue | on deck | on delivery | on demand |
| on deposit | on display | on draft | on draught | on drugs |
| on duty | on earth | on easy street | on easy term | on easy terms |
| on edge | on either hand | on either side | on end | on equal terms |
| on equal terms with | on every occasion | on every point | on every side | on everyone's lips |
| on everyone's tongue | on evidence | on examination | on exhibition | on faith |
| on familiar terms with | on file | on fire | on firm ground | on foot |
| on form | on friendly terms | on full pay | on good authority | on good terms |
| on good terms with | on grounds of | on guard | on hand | on hands and knees |
| on heat | on height | on high | on hire | on hold |
| on holiday | on holidays | on horseback | on ice | on impulse |
| on instruments | on issue | on it | on its last legs | on its merits |
| on key | on lease | on leave | on line | on loan |
| on many occasions | on margin | on maturity | on merit | on mortgage |
| on my word | on no account | on no condition | on notice | on oath |
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